Questions4 - Name: Chemistry 008, Spring 2008 Cornell...

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Name: Chemistry 008, Spring 2008 Cornell University Dr. Pontrello Due 2/24/08 Questions #4 (Prelim 1 Review) Any time you write down a number, please include correct units when applicable. Clearly write any equation(s) that you are using to answer each question, and also clearly indicate the steps used to answer the questions, if appropriate. Part I: Heat Transfer. I.1 (11 points) A combustion reaction releases 10.34 kJ of heat. This heat is absorbed by the surrounding 21.5 g of H 2 O, bringing the H 2 O to a final temperature of 31.5 o C. What is the initial temperature of the H 2 O? (for H 2 O: S liquid = 4.18 J/g o C, S solid = 2.05 J/g o C, q fusion = 6.01 kJ/mol)
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Name: 2 I.2 (12 points) A 644 J change in internal energy of a sample of solid CO 2 at -78.0 o C is caused by sublimination and raising the temperature to 65.0 o C under constant pressure. Calculate the mass of the sample of CO 2 , the change in enthalpy, and the work done. (for CO 2 : S gas = 0.850 J/g o C, q sublimination = 7.96 kJ/mol)
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This note was uploaded on 07/09/2008 for the course CHEM 342132 taught by Professor Davis during the Spring '08 term at Cornell University (Engineering School).

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Questions4 - Name: Chemistry 008, Spring 2008 Cornell...

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